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Finding the Fourth Proportional to 1,385.28, 2,078.88 and 922.08

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Solution

The fourth proportional to 1,385.28, 2,078.88 and 922.08 is: 1,383.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.28 : 2,078.88 = 922.08 : x
  2. Step 2: Convert to fraction form
    1,385.28/2,078.88 = 922.08/x
  3. Step 3: Cross multiply
    1,385.28x = 2,078.88 × 922.08
  4. Step 4: Simplify right side
    1,385.28x = 1,916,893.67
  5. Step 5: Solve for x
    x = 1,916,893.67/1,385.28
  6. Step 6: Final answer
    x = 1,383.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.